<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div id='demo'>
    <h3 v-if="ok">成功</h3>
    <h3 v-else>失败</h3>
    <h3 v-show="ok">success</h3>
    <h2 v-show="!ok">fail</h2>
    <hr>
    <button @click="ok=!ok">切换</button>
  </div>
  <script src='../js/vue.js'></script>
  <script>
    new Vue({
      data(){
        return{
       ok:false
        }
      },

    }).$mount('#demo')
  </script>
</body>
</html>